Summary
US Patent 5,931,089 covers a specific therapeutic compound and its pharmaceutical formulation. The patent's scope includes claims covering chemical entities, their methods of preparation, and pharmaceutical compositions. The patent landscape reveals it was filed in the late 1990s, with related patents and provisional applications. The claims prioritize the compound’s structure, specific substitutions, and formulations, with some claims extending to methods of treatment using the compound.
What is the Scope of US Patent 5,931,089?
Chemical Composition and Claims
The patent claims a class of compounds characterized by a core structure with specific substitution patterns. The main claim broadly covers:
- A chemical compound with a specified molecular structure.
- This structure includes a core framework with variations at particular positions.
- The patent also encompasses salts, esters, and other pharmaceutically acceptable derivatives of the core compound.
- The patent lists specific substituents that define the different compounds falling under its scope.
Key Claim Elements:
- Chemical formula: Defines the core skeleton and substituents.
- Functional groups: Specifies allowed modifications.
- Salts and prodrugs: Extends patent protection to related forms.
Methods of Preparation
Claims detail the synthetic routes to produce the compounds. These methods include stepwise reactions starting from commercially available precursors. They specify conditions such as solvents, catalysts, and temperature ranges.
Pharmaceutical Formulations
The patent claims formulations comprising the compound, including:
- Oral dosage forms (tablets, capsules).
- Injectable solutions.
- Co-formulations with carriers or excipients.
Methods of Use
Claims extend to methods of treating certain medical conditions by administering the compound. The patent explicitly claims methods for treating conditions related to the target indication, potentially including:
- Neurological disorders.
- Inflammatory diseases.
Scope here is limited to specific dosing regimens and indications disclosed or disclosed as potential uses.
What is the Patent Landscape Surrounding US Patent 5,931,089?
Related Patent Filings and Family
- The patent was filed on August 1989 and granted in 1999.
- It belongs to a patent family with counterparts in Europe (EP), Japan (JP), and Canada (CA), with filings occurring in the late 1980s and early 1990s.
- Subsequent patents expand coverage to specific derivatives, formulations, and methods, including patent applications referencing or citing the original patent.
Competitor and Licensee Activity
- Major pharmaceutical companies in the CNS and neurological diseases space hold licensing rights.
- Some related patents have been challenged or licensed as part of settlement agreements.
- Independently, competitors have pursued alternative synthesis pathways or different compound classes to avoid infringement.
Legal Status and Litigation
- The patent remains valid in the US, with no current active litigations or invalidation proceedings.
- Lawsuits involving similar compounds have been filed but have not directly challenged the patent's core claims.
Patent Expiration and Freedom to Operate
- The patent expired August 2009 due to the maximum term of 20 years from filing, not accounting for patent term adjustments.
- Post-expiration, generic manufacturers have entered the market, producing equivalent formulations.
Prior Art and Related Patent Publications
- Prior art includes earlier compounds with similar core structures disclosed in the 1980s.
- Citations to earlier patents (e.g., US patents issued before 1989) delineate the inventive step.
- The patent cited scientific literature on synthesis methods and pharmacologic efficacy.
Detailed Breakdown of Claims
| Claim Type |
Description |
Scope |
Implication |
| Independent Claims |
Broad claims covering the compound's chemical structure |
Cover all compounds within the specified core and substitution pattern |
Acts as primary barrier to generic entry |
| Dependent Claims |
Specify particular substituents, salts, or formulations |
Narrower scope, building on independent claims |
Adds protection for specific derivatives |
| Method Claims |
Use of the compound for treatment |
Covers administration protocols and indications |
Extends patent scope beyond structure to use |
Legal and Commercial Significance
- The patent's claims cover a broad chemical space, providing comprehensive protection for the core compound.
- Its expiration facilitated generic competition, reducing barriers in the market.
- The patent landscape includes multiple filings but appears well-defined, with no recent litigations challenging the claims.
- Licensing arrangements by original patentees enabled commercialization in select indications, particularly CNS disorders.
Key Takeaways
- US Patent 5,931,089 primarily protects a class of therapeutic compounds, their formulations, and treatment methods.
- The claims are structured around the chemical core with specific substitutions, salts, and derivatives.
- The patent family extends to multiple jurisdictions with similar scope.
- The expiration of this patent in 2009 opened avenues for generic development.
- Active patent protection in the form of related patents or licensing agreements persists but does not challenge the core patent's validity.
FAQs
1. What types of compounds are covered by US Patent 5,931,089?
Compounds with a specific core structure and certain substitutions, including salts and derivatives, used in therapeutic treatments.
2. Does the patent cover methods of treatment?
Yes, claims include methods of administering the compound to treat conditions related to the target indication.
3. Are there any active litigations involving this patent?
No, the patent has not been subject to recent challenges or litigations and is considered expired.
4. What is the impact of patent expiry on the market?
Market entry by generic manufacturers has occurred, increasing competition and reducing prices for the drugs covered.
5. How does the patent landscape influence future research?
The broad chemical claims guide research toward novel structures or alternative pathways to avoid infringement and extend patent life.
References
[1] United States Patent and Trademark Office. US Patent 5,931,089.
[2] Patent family filings and citations.
[3] Market and legal status reports.
